Nelson Michael D, Hughes Howard C
Department of Psychology, Missouri University of Science and Technology, 110 HSS, 1870 Miner Circle, Rolla, MO 65409, USA.
Percept Mot Skills. 2007 Dec;105(3 Pt 1):939-58. doi: 10.2466/pms.105.3.939-958.
Observers (N = 3, all males, M age = 30.7 yr.) were presented pairs of visual targets and instructed to fixate one as quickly as possible. The resulting saccades were of two types; bistable saccades accurately acquired one of the targets whereas averaging saccades landed at intermediate locations. The hypothesis was that averaging saccades result from a pooling of afferent activity prior to selection of saccadic direction and amplitude (i.e., coactive parallel processing) and that bistable saccades would show evidence of response competition between incompatible motor programs within a parallel architecture. Analysis of the distributions of saccadic reaction times showed that in all cases saccadic responses to double targets were too slow to be consistent with either the channel summation or any form of race model. Results indicate that inhibitory interactions operate during the selection of a target for a saccadic eye movement.
观察者（N = 3，均为男性，平均年龄 = 30.7岁）观看成对的视觉目标，并被要求尽快注视其中一个。由此产生的扫视有两种类型；双稳态扫视能准确地获取其中一个目标，而平均化扫视则落在中间位置。假设是平均化扫视是在选择扫视方向和幅度之前传入活动汇聚的结果（即共同激活的并行处理），并且双稳态扫视将显示在并行架构内不相容运动程序之间存在反应竞争的证据。对扫视反应时间分布的分析表明，在所有情况下，对双目标的扫视反应都太慢，与通道总和或任何形式的竞争模型均不一致。结果表明，在选择眼跳目标的过程中存在抑制性相互作用。
